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Finding the Fourth Proportional to 28,409.94, 42,621.12 and 8,690.04

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Solution

The fourth proportional to 28,409.94, 42,621.12 and 8,690.04 is: 13,036.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,409.94 : 42,621.12 = 8,690.04 : x
  2. Step 2: Convert to fraction form
    28,409.94/42,621.12 = 8,690.04/x
  3. Step 3: Cross multiply
    28,409.94x = 42,621.12 × 8,690.04
  4. Step 4: Simplify right side
    28,409.94x = 370,379,237.64
  5. Step 5: Solve for x
    x = 370,379,237.64/28,409.94
  6. Step 6: Final answer
    x = 13,036.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.